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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '984d310ce5f795211ec5810555e410e53396b535d66717f03b6f9af01c20c91e' 
  AND token = 'H8L/sIjtARp/N87v0TrfVop01WOcLlSlHHM3TIK6Tdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}